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From b3a070cf6fe04129d2c174e45c14b98a759e0402 Mon Sep 17 00:00:00 2001
From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Date: Fri, 11 Dec 2020 12:22:01 +0100
Subject: [PATCH] ARM: dts: bcm2711: Add reserved memory template to
hold firmware configuration
RPi4's co-processor will copy the board's bootloader[1] configuration
into memory for the OS to consume. Specifically, for the bootloader
configuration and upgrade user-space routines to query it through
nvmem's sysfs interface.
Introduce a reserved-memory area template for the co-processor to edit
before booting the system so as for Linux not to overwrite that memory
and to expose it as an nvmem device.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
[1] https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md
---
Changes since v1:
- Introduce compatible string
- Change alias name to something more explicit
---
arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -24,6 +24,7 @@
emmc2bus = &emmc2bus;
ethernet0 = &genet;
pcie0 = &pcie0;
+ blconfig = &blconfig;
};
leds {
@@ -215,6 +216,22 @@
status = "okay";
};
+&rmem {
+ /*
+ * RPi4's co-processor will copy the board's bootloader configuration
+ * into memory for the OS to consume. It'll also update this node with
+ * its placement information.
+ */
+ blconfig: nvram@0 {
+ compatible = "raspberrypi,bootloader-config", "nvmem-rmem";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ reg = <0x0 0x0 0x0>;
+ no-map;
+ status = "disabled";
+ };
+};
+
/* SDHCI is used to control the SDIO for wireless */
&sdhci {
#address-cells = <1>;
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